octet vs eight

octet and eight both are nouns.

Word	Noun	Adjective	Verb	Adverb
octet	Yes	No	No	No
eight	Yes	Yes	No	No

As nouns, octet and eight are synonyms defined as:

Other synonyms of octet include 8, eighter, eighter from Decatur, octad, octonary, ogdoad, VIII.

octet (noun)	eight (noun)
a musical composition written for eight performers	one of four playing cards in a deck with eight pips on the face
eight people considered as a unit	the cardinal number that is the sum of seven and one
a set of eight similar things considered as a unit
eight performers or singers who perform together
the cardinal number that is the sum of seven and one

octet (adjective)	eight (adjective)
	being one more than seven